Facial expressions, body posture and tail movement all reveal a cat's mood. To determine what
your cat is thinking you should observe their body language as a whole not just one aspect of it.
A relaxed comfortable cat points their ears forward, half closes their eyes, curls the tail and purrs. A cat that is afraid will have their ears back folded flat on the head, and their pupils will be dilated. An agitated cat has completely dilated pupils, flattened ears, forward sweeping whiskers, and may even show their teeth. A defensive cat will make themselves as big as possible, including brushing their tail out and extending their legs and backbone. And if you see a quickly twitching tail, this indicates excitement or imminent aggression. Cat's leave visual messages for other cats also. Confident cats are more likely to scratch and do so in front more subordinate cats.